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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+6.46%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ANIX icon
8876
Anixa Biosciences
ANIX
$126M
– –
-16,962
Closed -$65.3K
ANSS
8877
DELISTED
Ansys
ANSS
– –
-2,051
Closed -$650K
ANY icon
8878
Sphere 3D
ANY
$14.6M
$0 ﹤0.01%
+30
New +$750
AORT icon
8879
Artivion
AORT
$1.23B
– –
-8
Closed -$118
AOUT icon
8880
American Outdoor Brands
AOUT
$162M
– –
-163
Closed -$1.36K
BNBX
8881
DELISTED
BNB PLUS CORP
BNBX
– –
-1
Closed -$17.4K
APEI icon
8882
PUT
American Public Education
APEI
$875M
– –
-200
Closed -$1K
APH icon
8883
Amphenol
APH
$188B
– –
-10,440
Closed -$406K
APOG icon
8884
Apogee Enterprises
APOG
$850M
– –
-96
Closed -$4K
APPF icon
8885
CALL
AppFolio
APPF
$5.84B
– –
-300
Closed -$37K
APYX icon
8886
Apyx Medical
APYX
$165M
– –
-512
Closed -$2.59K
AQWA icon
8887
Global X Clean Water ETF
AQWA
$22M
– –
-81
Closed -$1K
ARAY icon
8888
Accuray
ARAY
$28.4M
– –
-3,706
Closed -$12.8K
ARAY icon
8889
PUT
Accuray
ARAY
$28.4M
– –
-700
Closed -$2K
ARE icon
8890
Alexandria Real Estate Equities
ARE
$8.88B
– –
-10,672
Closed -$1.27M
ARGX icon
8891
argenx
ARGX
$57.4B
– –
-7,239
Closed -$2.85M
ARKO icon
8892
PUT
ARKO Corp
ARKO
$890M
– –
-200
Closed -$1K
ARMP icon
8893
Armata Pharmaceuticals
ARMP
$171M
$0 ﹤0.01%
103
-97
-49% -$141
ARRY icon
8894
Array Technologies
ARRY
$818M
– –
-43,611
Closed -$934K
EFOR
8895
Everforth Inc
EFOR
$845M
– –
-157
Closed -$11.3K
ASH icon
8896
CALL
Ashland
ASH
$3.04B
– –
-100
Closed -$10K
ASHS icon
8897
Xtrackers Harvest CSI 500 China A-Shares Small Cap ETF
ASHS
$32.6M
– –
-100
Closed -$3K
ASML icon
8898
ASML
ASML
$675B
– –
-7,734
Closed -$5.26M
ASPN icon
8899
Aspen Aerogels
ASPN
$387M
– –
-53,586
Closed -$373K
ASPS icon
8900
CALL
Altisource Portfolio Solutions
ASPS
$65.4M
– –
-3,638
Closed -$133K
354 355
356
357 358

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.